Fuel oil filter



y 1944. v. R. PAWELSKY ET AL 2,354,051

FUEL OIL FILTER Filed Aug. 29, 1941 INVENTORS VERNON/Q. PAWELS/fy By W/LL /A/"/ A. B/ERMA/VN ATTORNEY.

Patented July 18, 1944 2,354,051 FUEL on. FILTER.

- Vernon R. Pawelsky and William A. Biermann,

Milwaukee, Wis., assignors to Automatic Products Company, Milwaukee, Wis., a corporation of Wisconsin Application August 29, 1941, Serial No. 408,768

Claims.

This invention relates to filters for liquid supply lines and more particularly to oil supply lines feeding oil burning devices.

Another object of the novel invention lies in the provision of an oil filter of single bolt construction which can be readilyand quickly disassembled for cleaning. i

A further object of the device of this invention is to provide an oil filter simplein construction, cheap to manufacture and yet eflicient in operation.

A still further important object is to provide an oil filter which can be cleaned and the filtering elements exchanged without removing the device from the system to which it is connected.

Another very important object of the present invention is the provision of anoil filter of a construction that eliminates air binding within the filtering device.

Our invention further'resides in the combination, construction and arrangement of parts shown in the accompanying drawing, and while we have illustrated therein preferred embodiments it is to be understood that the same are susceptible of modification and change without departing from the spirit of our invention.

In the drawing:

Figure 1 is a vertical sectional view of the device of this invention.

Figure 2 is a bottom view of the cover of the device of this invention with portions broken away.

Figure 3 is a top view of one of the elements used in practicing this invention.

Referring in detail to the drawing and more particularly to Figure 1, the illustrated embodiment of our novel invention comprises a cover C having an inlet I0 and outlet 12 integral therewith and provided with threaded portions [4 and I8 respectively, adapted to receive conduits, not shown. The cover C has a convex exterior surface i8 and a concave interior surface 20 with an annular portion 22 circumjacent the outer flanged portion 24. Projections 28 are integral with the concave portion 20 and space the screen 28 the desired distance from said concave surface to permit oil or other liquids to pass freely between said surface and said screen to the outlet l2. A hub portion 38 depends from the concave interior surface 20 and is provided with an opening 32 for communication of the inlet Ill with the chamber 49. The hub portion 30 extends to the top of the cover C where it terminates at 35. The portion 35 is adapted to cooperate with a gasket 36 to provide a seal against oil leakage to atmosphere when the bolt 34, which is threadedly interconnected with the bushing 40, is turned into said bushing. The hexagonal head 88 which is an integral part of the bolt 84 provides a means for turning said bolt into said "bushing heretofore The flanged portion 44 is held in sealed relationship with respect to the bowl portion 59 in p any suitable manner such as silver soldering." -A

plug 52 is threadedly interengaged with the bushing 48 and may be removed to withdraw sedimentfrom the bowl 48 thru the lateral opening 42' which communicates with the interior of said bowl. The upper portion of the bowl 48 has an annular offset rimmed portion 54 that carries a felt lining or purifying element 56 having a central cutout portion 51. The felt lining 56 has disposed atop thereof a gauze or reticular like material 58 which prevents loosened fibres from the felt 56 from passing into the system (not shown) to which the device of this invention is connected. The screen 28 as explained above is spaced from the concave surface 20 by the projections 28 and forms a foundation or support for the elements 88 and 5G.

The felt or filtering element 55 is clamped at its periphery between the elements 84 and 22. The central portion of the filtering element 58 is held firmly against the screen, so as to follow the contour of the screen 28,by a retaining spring 60. The spring 60 is comprised of two concentric convolutions 62 and 84 disposed in parallel planes.

The convolution 64 engages the rabbeted portion 66 of the hub portion 30. The lower convolution 62 encircles the interior cut out portion 51 of the filtering element 56 and retains same against the ledge 68.

To the top portion of the bowl 48 is formed an out-turned circumferential portion 18 which is adapted to ride on a gasket 12, intermedial the portion 18 and the flange 24, to provide a seal for said bowl. The bottom of the bowl 48 has ribbed portions 16 provided therefor to give it greater rigidity.

Much trouble has been encountered in the past in the way of air binding in fuel oil filters of the type described. The device of this invention provides a novel construction which eliminates the aforesaid trouble by avoiding conditions favorable to the formation of air pockets. Air, because of its inherent properties is constantly trying to work out of the oil to the atmosphere and we provide a rounded or concave felt portion 56 which permits any air bubbles rising from the oil in the bowl to work their way along this curved wall structure and into the opening 32 which communicates with the inlet. After reaching the inlet ill the air ,is free to pass out into the. line, not shown. A positive means for the escape of air within the chamber 49 to atmosphere is assured by the novel construction of this invention.

Having described the invention, we claim:

1. In a device or the character described having a concave cover provided with an inlet and outlet, a screen mounted on said cover in filtering relationship to said outlet and adapted to follow the contour of said cover, a bowl forming a chamber and having a reinforced bottom, a bushing secured to the bottom of said bowl, a single bolt connecting said cover and said bowl, a gauze element held in contact relationship to said screen, a purifying element held in contact relationship to said gauze element and being concave at its interior surface so as to allow escape of air from said chamber, a retaining, spring for said purifying element.

2. In an oil purifier the combination of, a cover having a concave interior and provided with an inlet and outlet, a bowl forming an oil chamber for said purifier, a screen adapted to substantially cover the interior surface of said cover, a purifying element adapted to substantially cover said screen, said purifying element being curved upwardly to allow the escape of air bubbles rising from said chamber, a bushing, having a. lateral opening therein, centrally disposed in said bowl, a bolt, suited to hold said bowl in sealed relationship to said cover, a retaining spring encircling the interior portion of said purifying element and removabiy engaged with said cover portion.

3. In an oil purifier the combination of, a cover having a concave interior and provided with an inlet and outlet, a bowl forming an oil chamber for said purifier, a screen adapted to substantially cover the interior surface of said cover, a purifying element adapted to substantially cover said screen, said purifying element being curved upwardly to allow the escape of air bubbles rising from said chamber, a bushing, having a lateral opening therein, centrally disposed in said bowl, a bolt, adapted to hold said bowl in sealed relationship to said cover, a plug threadediy interengaged with said bushing to permit removal of sediment from said bowl, a retaining spring having its upper convolution engaging said cover and its lower convolution encircling said purifying element.

4. In a device of the character described having a cover provided with an inlet and an outlet, a filtering element in filtering relationship to said outlet, said filtering element being formed with an upwardly extending lower surface having its highest point adjacent said inlet for guiding air bubbles thereinto, a bowl associated with said cover and having a bushing secured thereto and centrally disposed therein, and a single bolt passing through said cover and threadedl engaged with said bushing.

5. In a device of the character described having a dome-shaped cover provided with an inlet and an outlet, a filtering element mounted on said cover in filtering relationship to said outlet, a bowl associated with said cover and having a bushing centrally disposed therein, said filter element being secured at its periphery between said cover and said bowl and being dome-shaped to guide air bubbles into said inlet opening located at the center of said dome-shaped element, and a single bolt passing through said cover and threadediy engaged with said bushing.

VERNON R. PAWELSKY. WILLIAM A. BIERMANN. 

